Good day. This is a bug in my system or in the kernel. INIT: version 2.96 booting The system is coming up. Please wait. [ 8.699456] udevd[167]: starting version 3.2.9 [ 8.713802] udevd[168]: starting eudev-3.2.9 [ 8.720717] scsi 0:0:0:0: Direct-Access Kingston DataTraveler 3.0 PMAP PQ: 0 ANSI: 6 [ 8.731028] sd 0:0:0:0: [sda] 30277632 512-byte logical blocks: (15.5 GB/14.4 GiB) [ 8.742137] sd 0:0:0:0: [sda] Write Protect is off [ 8.748454] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 8.831387] tegra-host1x 13e00000.host1x: Adding to iommu group 6 [ 8.842994] tegra-hda 3510000.hda: Adding to iommu group 7 [ 8.848819] tegra-xudc 3550000.usb: Adding to iommu group 8 [ 8.872093] mousedev: PS/2 mouse device common for all mice [ 8.886474] input: jetson-tx2-hda HDMI/DP,pcm=3 as /devices/platform/3510000.hda/sound/card0/input6 [ 8.896001] sda: sda1 [ 8.896944] input: jetson-tx2-hda HDMI/DP,pcm=7 as /devices/platform/3510000.hda/sound/card0/input7 [ 8.910596] sd 0:0:0:0: [sda] Attached SCSI removable disk [ 8.938033] at24 6-0050: 256 byte 24c02 EEPROM, read-only [ 8.946665] at24 6-0057: 256 byte 24c02 EEPROM, read-only [ 8.984839] dwc-eth-dwmac 2490000.ethernet: Adding to iommu group 9 [ 8.994168] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000140 [ 8.994838] dwc-eth-dwmac 2490000.ethernet: no reset control found [ 9.002990] Mem abort info: [ 9.003006] ESR = 0x96000004 [ 9.015056] EC = 0x25: DABT (current EL), IL = 32 bits [ 9.020363] SET = 0, FnV = 0 [ 9.022792] dwc-eth-dwmac 2490000.ethernet: User ID: 0x10, Synopsys ID: 0x41 [ 9.023415] EA = 0, S1PTW = 0 [ 9.023417] Data abort info: [ 9.023418] ISV = 0, ISS = 0x00000004 [ 9.023420] CM = 0, WnR = 0 [ 9.023423] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000269926000 [ 9.023424] [0000000000000140] pgd=0000000000000000, p4d=0000000000000000 [ 9.023429] Internal error: Oops: 96000004 [#1] PREEMPT SMP [ 9.023431] Modules linked in: tegra_drm(+) dwmac_dwc_qos_eth(+) cec stmmac_platform drm_kms_helper stmmac at24 drm tegra_bpmp_thermal mdio_xpcs snd_hda_codec_hdmi mousedev tegra_xudc snd_hda_tegra snd_hda_c1 [ 9.023450] CPU: 5 PID: 170 Comm: udevd Tainted: G S 5.7.0-rc4-next-20200508 #1 [ 9.023451] Hardware name: NVIDIA Jetson TX2 Developer Kit (DT) [ 9.023454] pstate: 20000005 (nzCv daif -PAN -UAO BTYPE=--) [ 9.023461] pc : __iommu_probe_device+0x30/0x1b8 [ 9.023470] lr : iommu_probe_device+0x28/0x158 [ 9.030784] dwc-eth-dwmac 2490000.ethernet: DWMAC4/5 [ 9.033648] sp : ffff80001446b920 [ 9.033649] x29: ffff80001446b920 x28: ffff0001e8a28818 [ 9.033652] x27: ffff0001e8a28808 x26: ffff0001e9964080 [ 9.033654] x25: ffff0001e99648e0 x24: 0000000000000000 [ 9.033656] x23: ffff0001f4e37390 x22: 0000000000000000 [ 9.033658] x21: ffff800011a39000 x20: ffff0001e8a28818 [ 9.033661] x19: ffff0001e8a28818 x18: ffffffffffffffff [ 9.033662] x17: 00000000000000c0 x16: fffffe00076b1a48 [ 9.033664] x15: ffff800011a39948 x14: ffff0001e996091c [ 9.033666] x13: 0000000000000040 x12: 0000000000000018 [ 9.033668] x11: 0000000000000003 x10: 0101010101010101 [ 9.033670] x9 : fffffffffffffffb x8 : 7f7f7f7f7f7f7f7f [ 9.033672] x7 : fefefeff646c606d x6 : 1e001e0ce4adeef5 [ 9.033674] x5 : 756e2d640c1e001e x4 : 8080808000000000 [ 9.033676] x3 : 830b9b4b216b73a8 x2 : ffff800008dcd030 [ 9.033678] x1 : ffff800008dcd030 x0 : ffff0001e2c5e580 [ 9.033680] Call trace: [ 9.033684] __iommu_probe_device+0x30/0x1b8 [ 9.033686] iommu_probe_device+0x28/0x158 [ 9.033689] of_iommu_configure+0x200/0x218 [ 9.033694] of_dma_configure+0xd8/0x208 [ 9.033708] host1x_attach_driver+0x164/0x320 [host1x] [ 9.033716] host1x_driver_register_full+0x84/0xe8 [host1x] [ 9.033739] host1x_drm_init+0x34/0x1000 [tegra_drm] [ 9.036786] dwc-eth-dwmac 2490000.ethernet: DMA HW capability register supported [ 9.040435] do_one_initcall+0x60/0x1c0 [ 9.040439] do_init_module+0x58/0x1d0 [ 9.040441] load_module+0x1eb8/0x2310 [ 9.040443] __do_sys_finit_module+0xdc/0xf8 [ 9.040445] __arm64_sys_finit_module+0x20/0x30 [ 9.040448] el0_svc_common.constprop.3+0x68/0x170 [ 9.040451] do_el0_svc+0x24/0x90 [ 9.040453] el0_sync_handler+0x13c/0x1a8 [ 9.040455] el0_sync+0x158/0x180 [ 9.040460] Code: f9417400 f9403261 f9404c36 b4000b00 (f940a2c0) [ 9.040463] ---[ end trace a171a8cb8951077a ]--- Best regards -- Remember, no question is too stupid and no problem too small -- We've all been beginners